The 3D modeling and visualization of geologic body based on GIS

Based on Geographic Information System(GIS) technology, the research of 3D geological modeling(3DGM) is carried out. The 3DGM method focused on complex geologic body is put forward, and modeling process is set up. First of all, according to the different strata, index layer of fault-block polygon is built. Then under the restraining of seismic interpretation surface and fault-block boundary, digital elevation model (DEM) tiles are built aiming at fault-block polygons in index layer. Based on index layer, DEM tiles are assembled into DEM of stratum aimed at index layer. Finally 3D structural model is built through overlaying DEM, and 3D geological model is generated based on 3D structural model. Taking Shu II district in the Liaohe Oilfield for example, 3D geological model of Dalinghe reservoir is successfully built based on this method. Visualization of model is realized through 3D GIS technology.